The Littelfuse 330RN is a fast-acting resettable fuse, or polyfuse. It is designed to protect against current surges in both AC and DC circuits, and is especially suitable for sensitive electronics. The fuse has an adjustable current rating, so that it can be set to open when the specified current is exceeded. It is designed to reset, via a thermal reset mechanism, when the overcurrent condition is removed. As well as providing protection against sudden power surges, this fuse can also be used as a circuit breaker. It is RoHS and Reach compliant, measures 5.1 As, and is rated up to 2A and 250V AC/DC.